In Raiders of the Lost Ark, when Indiana Jones and Sallah are preparing to remove the stone lid off the sarcophagus of the ark, we see a wall of hieroglyphics behind them with many figures resembling people.

If you look closely you’ll notice one of these is actually a rough depiction of Princess Leia inserting the Death Star Plans into R2-D2 with C-3PO approaching from the right. As the picture can be hard to see, we’ve also included a clearer one of unknown origin below.